Improved extension-table slide



diluted fglm @sind @Wire Letters Patent No. 94,486, dated September 7, 1869.

IMPROVED llElXTlElNSION-TABIIIIEI SLIDE.

The Schedule referred to in these Letters Patent and making part of the same.

To all 'whom 'it may concern:

Be it known that I, S. J. GENUNG, of Waterloo, in the county of Seneca, and ,State of New York, have invented a certain new and useful Improvement in Extension-Table Slides; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings, making part of this specifica-tion, in which- Figure 1 is a perspective view of a set of extensiontable bars, with my improvement attached.

Figure 2, a cross-section ofthe same.

Figure 3, a perspective view oi` one of the slides.

Like letters of reference indicate corresponding parts in all the gures.

My invention consists in a peculiar construction of. the slides proper, whereby tongues are made to project down between the wooden bars, to keep them apart, and thus prevent friction; and a dovetail or wedge-shaped lug' is made to serve as the attachments of the slides to the wood, instead of screws, thereby avoiding expense and labor.

The invention further consists in the combination, with suoli slides, fastening vertically upon the top and bottom of the bars, of a central tongue arrangement of slides for completing the construction, the whole as hereinaftcrset forth.

In the drawings- -A A A represent the ordina-ry extension-bars, arranged in the usual manner, except that a central groove,a, is cut longitudinally in the face of each, in which slides a tongue, b, of the next-these tongues serving as stops when. they strike together at the ex tent of movement of the bars.

At the upper and lower inner edges oi' the bar are also cut longitudinal groove, c c, in which rest the ordinary bearings (l of slides B B.

These slides B B have, in addition to ordina-rybearings (l, central vertical tonguesf, which extend `down between the bars, and serve to separate them from Contact with eachother.

They also have vertical doveta-il or wedge-shaped lugs, g, cast on one side of' the tongues, which enter corresponding slots cut in the wood, thereby holding inplace without screws, which are generally used.

The novelty in this construction consists, essentially, in the tongues f and lugs g. These tongues,

by rest-ing between the bars, separa-te them, so that no dil-liculty can arise from friction in the swelling of the wood.

Very great difiicultyjs experienced in ordinary extension-tables bythe swelling of the wood in damp weather, causing the long contact-surfaces of the bars to adhere, when it is almost impossible to remove them, especially when warped out of place. I obviate all difoulty ot' the kind, for thc. bars are perfectly separated their whole length, and the friction-surfaces ofthe tongues are very small.

The lugs entering the bars at right angles to the motion ot' the slides, cannot become detached under ordinary circumstances, as the grain of the wood comes in close contact and binds them in place. I

thus avoid the necessity of forming screw-holes in the slides, and using screws, which are expensive.-

ln connection with these slides B I', holding upon the opposite outside edges oi' the bars, the central blocks or tongues b, -holding in the grooves a, are of importance, as thereby the connect-ion is greatly strengthened, and undue strain is prevented from reaching thc outside connections. The central connection holds the vertical strain, while the outside ones hold thc horizontal or lateral strain.

By the use of' the slides, as above described, it will be noticed that no extra and expensive machinery is required for cutting and fitting thcgroovcs of the bars to receive them, as is the case in the use oi' many other kinds of slides.

A simple circular saw will cnt allthe grooves in luy bars, since the work is all plain. I'n others, it is necessary to have special machinery for the purpose.

What I claim as my invention, and desire to secure by Letters Patent, is-

l. lhe construction of the slides B B', with the central tongues j, or equivalent, for separating the bars, and the dovetailed or wedging lugs y, for attaching the slides to the wood, substantially as de scribed. l

2. In combination with the outside slides B B', the central connection a b, substantially as described.

In witness whereof', I have herclmto'signed lny name, in the presence of two subscribing witnesses.

S. J. GENUNG. lVitnesses It. F. Oseoon,

GEO. W. MIA'r'r. 

